Top: ratio of fs^{1 / 2} of the first and subsequent measurements for those solar system objects that were detected in more than one survey. Measurements at 857 GHz are shown in blue, measurements at 545 GHz are shown in green, and measurements at 353 GHz are shown in red. The grey line shows , which one would expect for Rayleigh-Jeans objects. Bottom: spectral index for those asteroids detected in multiple frequency bands for a given survey, defined as . Juno and Vesta are shown in brown and yellow, to indicate that they have different spectral classifications than Ceres, Pallas, Hygiea and Europa, shown in shades of blue. The white symbols show the corresponding values for 353–545 GHz, where they exist. For both panels, the symbols used for each object are: 1 Ceres – circles; 2 Pallas – squares; 3 Juno – diamonds; 4 Vesta – hexagons; 6 Hebe – +; 8 Flora – ×; 9 Metis – upward-pointing triangle; 10 Hygiea – right-pointing triangles; 19 Fortuna – vertical lines; 45 Eugenia – downward-pointing triangles; 52 Europa – stars; 324 Bamberga – left-pointing triangle; and 704 Interamnia – horizontal lines.